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4x^2+3x−6

Step-by-step explanation:

subtract

4x^2+3x-6

Step-by-step explanation:

(-4x^2+x)-(-8x^2-2x+6)

-4x^2+x+8x^2+2x-6

4x^2+3x-6

number one is the correct answer

step-by-step explanation: dogs and cats are mentioned, no other animals

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.